In the Styles Actions, add a new "Sync styles" option which renames Styles according to their connected tokens (via Themes), deletes any styles that are not referenced, and creates new styles that do not exist yet

[six7]

As users might rename, create or delete new tokens outside of the Plugin or outside of the library file we are in right now, we need to provide a way so users can 1-click Sync styles according to the new JSON.

To do that, let's add a Sync styles option to the Styles dropdown.

Depending on if the user has an active theme:

Active theme

• Remove any styles that do not have a style associated (e.g. the user deleted a token on GitHub but now the token needs to be removed as well)
• Update all values of styles
• Rename styles that are associated with a token and where the token name is different than the style name

Not-active theme

• Remove any styles that do not have a token that matches its name
• Update all values of styles

We should probably add a Modal that appears and asks if they want to (checkboxes):

• Remove styles without connection
• Rename styles

One caveat: We should respect the user's setting on Ignore first part of token name for style and Prefix style with active theme name.